Helmet with mouth guard



FIG. 1 is a front view of a helmet with mouth guard showing my new design;

FIG. 2 is a left side view thereof, the right side being a mirror image;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a rear view thereof.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a helmet with mouth guard, as shown and described. 